Judging by past experience with our New Generations of retail store cashiers and making change for a cash transaction, the transition from bar code to barter is going to be almost instantaneous.
Add the spectacle of those same individuals attempting simple addition simply adds a dose of humor.....and figuring Sales Tax turns it into a farce.
True story.
Be me. Go to McDonalds. Order a meal. Comes to $6.13. Give attendant a 10. She rings it up before I pull a quarter out and put it on the counter.
See panicked look on her face. Say, "Just give me three tens and a five."
She takes money out of register. I have to stop her and explain it was a joke. She doesn't get the joke.